These 12 sided dice aren't regular dodecahedrons. The're oddly wonky. But amazingly they are totally fair. That's because they are isohedral, meaning every face can be mapped onto every other face through a symmetry of the object.
These objects have a handedness. Which is to say the mirror image of a dice is not the same as the dice! So here, you get a set of 2, the right-hand version and the left-hand version!
Also check out the skew d6s.
Price = p125 pence = £6.91